Reguarding nikon lenses on canon bodies, it can be done but you wont get autofocus and unless the lens has an aperture ring you also wont be able to stop down to smaller apertures.
There is an adapter that will give you the focus confirmation bleep when using nikon lenses on a canon body but thats about the most amount of talking between them you'll get.
There is an adapter that lets you use canon lenses on a nikon body but its quite expensive and will degrade image quality, increase the magnifcation and lower the amount of light getting in as it requires optical elements to refocus the lens.
Generally speaking they are incompatable in any real way (although I do use a Nikkor micro 55mm f2.8 macro on my 20d)
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